package com.sfac.springboot.interceptor;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class ViewMappingInterceptor implements HandlerInterceptor {

    public final static Logger LOGGER = LoggerFactory.getLogger(ViewMappingInterceptor.class);

    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws Exception {
        LOGGER.debug("====Pre interceptor=====");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response,
                           Object handler,
                           ModelAndView modelAndView) throws Exception {
        LOGGER.debug("====Post interceptor=====");
        //判断请求是否为接口，如果为接口直接返回
        if(modelAndView == null){
            return;
        }

        //判断页面请求是否为重定向或者转发，如果是则返回
        if(modelAndView.getViewName().startsWith("redirect")||
            modelAndView.getViewName().startsWith("forward")){
            return;
        }
        //获取请求路径
        String path = request.getServletPath();

        //判断 modelmap 中是否有template ，有则跳过，无则根据请求路径设置我的template

        String template = (String) modelAndView.getModelMap().get("template");
        if(StringUtils.isBlank(template)){
            modelAndView.getModelMap().addAttribute("template",
                    path.substring(1,path.length()));
        }

        HandlerInterceptor.super.postHandle(request,response,handler,modelAndView);//丢出处理过的部分

    }

    @Override
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response,
                                Object handler,
                                Exception ex) throws Exception {
        LOGGER.debug("====After interceptor =======");

    }
}
